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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cf289c113d3dafa450d90598256be56e9724b7380e10051be77b812d3616ab' 
  AND token = 'GusCBB9aqrLhqwbBbbqzbdWYB7TmIlA8XGO81jApFOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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