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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fcd84876fa34ad4bd0c2f49232d8ccca33afa05ea5733d7ed12772cb0d634b' 
  AND token = 'hPGSrVBW6S4Sp119KS0B46+AJNnJryYQzmIHuDWCVo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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