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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61af0653616a2c4a9ea01db4e73fc65afc6b41c3b5a0ed0eef702ec1341541f4' 
  AND token = 'S0JJm4xV438xSydAkROz4bzr/K/6rHvUXkBiyOdGD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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