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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439e58bc8b81f55e7ed120b71392c149c3304c2731be01e41965cf33c124bd16' 
  AND token = 'eukvpGxkYh/py9+0NxD+cq5FEK2Xjkf9rvtWLCpauwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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