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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c553a086c03d71b3f1ec4a45c6fb4019ae0c292c51bf0fcc4a882e76e912801e' 
  AND token = 'f9fxNQYzKdfqgKn09LKluOJ7Dhda+VvLgGlQPi0cMk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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