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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda57675836a97a40607b8077459a808fbadbfee8d922b97b8555fb7bdf050ab' 
  AND token = 'BGbZXibyb/GX3g6PHLHXTUnXL/liGn0DdVC1Aws3thU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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