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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afabdad40cc202816d16e2d3cfbb444acf79b0e2e864965c62879bb4271e04a' 
  AND token = 'PuJd4rMqD1Say8WcLaVh8SfQYshg+MlA9dZO0QkvTg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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