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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e6cc7a44e9edeaf7ad398da0c12ec4f29cd0d7a3b39e199a8e14a4fb72a418' 
  AND token = 'LspupTO9aN7qxYyEwJ80T2H7tNkaZZ83T02ND2MvzOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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