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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6942b70b8d81c806e222174bc59a6ad7fec80f817b759dbb0fc52dca1d207faf' 
  AND token = 'L9Cwr8dwJy+wsp3ATvETaaqllVaLLYmNgSw7v9FM0is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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