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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0e02a5a483c1f030f5c5a16a903015d00164a06ac9359bd5756284f475580c' 
  AND token = 'iOgIRXDlljQoR5w0CsRsS343pNU1Uvr/kDZ8yNbhQrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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