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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b09989864ccec20febd6c8d4f2737bc05ab9ea386b5cc434e6ea4e5fe0e0930' 
  AND token = 'YInsHfWdyUxkXlCF5Rst57UnZ4g8SYsWFE0nL9tFL9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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