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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05aaeab3fd53a3c8799c8e2d504c63f5b5e622a8040c45a5ed975e664b7a60e' 
  AND token = '4HpOnBPx3xwun2eUE6VMPzjMVjulGvimKYQwLSkOQfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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