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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd088387f6914d0ca33605da4e06f24959069368007c41c0fa421be0dd4134eb1' 
  AND token = '9s/V9ifGlTZ6VQWxlsWgUz+s8YRktsWB4gjqNsSXsGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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