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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef72babc8a984ccb2d40da4fe807f8ce66a8d9f7e072e275b8f82c6ae564ce5' 
  AND token = 'tyjQqj3mbPBbTKxQH5tfvQRJSbpXvJsKZIZp8klu9uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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