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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6656dd510bf676338751f37569f11246866359be018ef8edd7a8ac9c1c85cca' 
  AND token = 'Di4UOc3Wh5lmRWzhWZjrtMJn6TjB1QyVf03ycn/awls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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