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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f07cf88e458d8f0d3cefe1d9c1d3a780517bdd54bc1b63f976a2138ee8cfbe3' 
  AND token = 'RVkuDxAu9QnNAnLagIiOLEXCO6piz8QqgXEgI5SzvRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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