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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9091ef42c024ffc3c03064cc1b9c0d7f53886cf70ce707366bc1aa83d99bcf7a' 
  AND token = 'vPcMAmkOaFkOn9v2B9sc99wk6oDKd2ujSCV6Q1J5iJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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