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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43cd13480130874d468eedf5f136d913daeceb7df238c8eb88c8380fe870efe' 
  AND token = 'lrYgWRRK8elbbaXNY/P0zxGejhW3viHOXB5xtoRGK6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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