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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9699b75d6050070417f3b3d169b5458fcf4be9ec69173e12f06feefd5db0fc' 
  AND token = '2mcImAZung69VYFc9fRp/8qm3QrIHkP0nsGtlUsiNj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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