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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d609b2562753a79da0f4579f520c64ee6c8d6f27036e238d30ec077a6f876f' 
  AND token = 'Z8X84iI9UlruXRgWO/ZdzK4W5K2aRvdjwvB4weiwvXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}