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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef824dc2152d74adb8006c346b4dd8cf3f3c7468a41ff1e0498570e4bb44ddf' 
  AND token = 'X8RbF9dXPtyWg8dnj80GBJShSbfKhbYOXvkGQzOcM1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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