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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3873c466e435f5d912746fb7f96b1b71ac9c45f684639c3e66103f8e217c13c8' 
  AND token = '60KFo/VeBNMR7nwEGIxKmyteDJIe7Au4W+OP47JtVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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