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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1551a3bae937953bebb5b5b3710670e7323fb787a92143fc7cd4c979fd80e5' 
  AND token = 'f/+GdOudjfsmOXLjIj8GJEqWVpQ0dUcs1MSK2GGsEO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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