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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a89923f6c9f96d3389199cb951ed4797582f78eccc5c3a978449357e4523ae8' 
  AND token = '0iRd98I7QJVB11i3gXxC2/Kc9DowGIHEicU8P0MQG/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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