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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e19194caf4599a1e5647de944d4059fb7f4e5969f32e19f2d66babc4ed110f' 
  AND token = 'sLCCB7tQoX9vlDUfjaZG5um26YO7bC8ZrLJSadCR/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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