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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8354ce5c9ed6c83a52b8eac45718b95cda65fa6acfd743b3d3c35046772d550' 
  AND token = 'Cln8jobWBHKd/z4R5INteUVpCH6a9t82TtgEu2pLRuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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