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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca8ec3f3565e9d9d0f7810573bcb9ed68e609e9a55d796062ae3f34f67a182c' 
  AND token = '66Xv2tJ6Ryb7KwHFheEE7a3HPapa+bMnoJAOeKu+FII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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