SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc342e1d2f273f49bcf0fa432f6cf219751982f1a941ebefc84f15a7955287c5' 
  AND token = 'gBRXCZap7bAWqj7t0CxByKMFugDQvm1XqkhJk+1Eus0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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