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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a23b238eda5c01c4766c61d2b370c035c2685a6719e41f2b0fff99605ea5b7' 
  AND token = 'ZEl9CK0utGOqCODKOdKS9LR4eyUwhUQXWylSzMtgrtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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