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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c23597404461a7489015aa64e71b28b21438716dfff5bd1579856c5ef9a746f' 
  AND token = 'u+Fsb7y+ofAOcclSZIYce+F20mDO8wjqqHN6Zj88YDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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