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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8d5921af7975703c9331cc28f8f8294974e88ddc9b4c5f236e0fe2cb802e55' 
  AND token = 'VcV285YpK8TkJEhCooZNqTzA5omb3qrQUg2SmhhNbJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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