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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409adc08e42d387fd09ca90a3348f6a04cb140001de24321d35ae2c6da4cb462' 
  AND token = 'hXAW3rYWVf+bWnM7VSzsDBZO8dRoxy0Ay3Y6Mt8QA3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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