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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f6ff1bcf09e3598a92f53872dc82fb41d3641ec6b713cdcc726f1b8436c84e' 
  AND token = 'bNqM2kEC3XaK/8MU7wNfMkHXhN+3lMXR3Yl0PiirbfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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