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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a275d22efa89714094d8724d67a805f172e244975d7492df0c48a3293001d5e' 
  AND token = 'BBXuqKpK3yXsolrDybt9o0Vj37t5xm1qtD192UPIQSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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