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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808eabde9466d7ccaddf5dcc5c46bcc213419562e48562a65b1e4f5e74a1f21e' 
  AND token = 'r6Fa7r5d6qAaVXiLhcv8TA90G6mSCAmUCgg9V6gv1+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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