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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ceba37586227d1bd7e3823d27d4a82a6cda995da947e0feaa372f295d8296fb' 
  AND token = 'iSoq0v1xgqoJaEszlbTIKFdtKY/E3OJuODfiRwh0/mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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