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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaa6d2e99604fd6fa7d674aee4b817235c0dc1b097cf181de161308dcb92045' 
  AND token = 'tonEsG0ZIXlrxKctfYgkigzMJYU6IEG5mWSL+D0Tw8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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