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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15c3d95088a442af6eb06f6b39586c276e92695bff36ad2efc39d8410e57d87' 
  AND token = 'ghS2W2zkqEcDiRlFzlTE8EcrzLnev8GVoEB6zvLg6aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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