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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e5adba4b94d611a00c6dd51ebfc7470dded5db2ca87b7cdce748d2858f50c9' 
  AND token = 'Ew1PmBSPjztNJvX647HSdQBAhlZoKDrwG9RbjA8dvC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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