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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddb77f20f16d10fc1d152d7e03dd74af04b9be21b954cbbce0cfb6c5df28529' 
  AND token = 'Xw1S+o4siX/QNy68WijGq/MH3wkIzpzvJ196aIDa+ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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