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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e519702225ccd4080ea4adef79ddb0712e91f83d48dfff6f2c8308f745254438' 
  AND token = 'AQm++V4W0mMHMdGEcqReiGs9pyjz7IKzQsNjPVX1F6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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