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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1714a436b477efaf1561df7fbdf231ee68c77cda0506b218fe528b2dacf6e7fd' 
  AND token = '5SwlREWnjXCAY7XG5f0g08cMaK5v/A3bVrEXx1FIiy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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