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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f175b7e432f90ba4178f3ec978dbcd634ff8e481580a47e0e425eaba5df6ae' 
  AND token = 'c6+FaSxPg2dr85mwtrNw2tlpZTf4bthCr0R7erGw0yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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