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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13699244223335ee1f09c31d7b282eddb20ad16444b7e10bd97b1bc2463b03f' 
  AND token = 'gYU0jK0jblvtm46qh03YpVRArZeMz/0cqGp/FeVQHzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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