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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b041a8117d85397f136e976d3a9f875d8659fbaf7c67cc6b78cd85a19f2d523d' 
  AND token = 'IZno6qt64ZP+0ufiKmv5V5IbjVEUO/ikDelbrj5uTPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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