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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4954efe21a108469865d3d68f6d2d70a39bc7ca7444f705d7d6e4a708c69073' 
  AND token = 'n7HiqCJEO5rrwmLTURCMCN6DZvzFyL+gpe7wt1nmvxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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