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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198e415fc2c4da677e3d15aa8a51966c46b88b8642d5778311073ea4d7da9869' 
  AND token = 'MTS185cJJ07yrIcqeH9iNTcz8U0nHkQ4UturElKZfIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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