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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4041e9dedb8dc53318eec8646bc0e671b6d857276acc05d2b9a850e9f899bf' 
  AND token = 'YQPFjOsqsxX669C/RWJcFTDDogOxNxt2WiQclNf0j5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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