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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984589af82c9be59ce54ae732557e1ef00dbfe7756ea796c69fe543054993d0b' 
  AND token = 'nZOsdzYQ09F93RcEwz7//Tpn+G/o/srY6kIN+FGb8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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