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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd27a3947ec0db0a42c436f9d6e80b28b77026f68a796054e179b46265e74a38' 
  AND token = 'Kd4MD1mGMsDRkWrJ3D0OensdtzYYXz+Lbu1QFIfPsH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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