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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419838785690b5ceccbee6045f7e3b0eb42935c9c74681552b223d1ced50d2fc' 
  AND token = 'chBWAtYFd6/xdf6PL1mlQW07D9xfiFXgXrnNOcIzGhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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