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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9a7bc229666941ab990b6e6085799105d17b1d695a85bcf1bd154f9ffd478d' 
  AND token = 'H5SyEpYGJ0xSgvsXB+dqUfsiQvjMx6cNkdfGHQiR3nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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