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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ed9e9f7e722bf40f75fec6eafcacb904a8d4af8d6155d2ab73144d6cfe870e' 
  AND token = 'xdggPmVWhZhDFf2RD/y3E4LNg/ihbMBAC/rgucXSC+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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