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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83402f4f1a528cb905836cb0bdccdcdca5a5072466efc47c498c1b0d8c811e03' 
  AND token = 'u71gM7Ocivs3d20Op79e8lKO2FsiFiV2JfDd46o5vFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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