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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e3cf1b054063fee6f38356d1531e8bdfd2e898b3391e4db89a9fff432b3b7d' 
  AND token = 'NVo0R1z4pZqZlSakWn3+NYRpRdB3VgXnxRqfcSV+3ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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