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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cf0bd1a17ce1ce2a6bb09b10e8acb2ac4bd0fce02faec1d6fe442a9ee6095a' 
  AND token = 'LxSnvbSswT6OmqDw3bgrRDM8Ho5jSs5eWs4XN2Z5Y3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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