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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4824e8a82ac539bbe19662a20f6bad2a89fe23964b003c0f7e8570278ac02fcf' 
  AND token = 'adhMbuT/eGTPRkuxgWgHnK8iVwdcAoRByQuWW0pKVKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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