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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a4a6266eba9bdbeca300b3bc6aad30aff01db35d4adda08e5d22763b0e37a3' 
  AND token = '2hLQPicvLbf/TKiRFL7XuW5KB7M4brup+SxrRQoCSwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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