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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4263700e97a00b51c8613806bc6947d7476eab7f0eb816bc5a788b023d8384' 
  AND token = '9L7zZqhpSwpC67J8XyrpVUCOTjqI4sJcbN4sJLslqck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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